mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:59:27 +08:00
104 lines
3.2 KiB
Go
104 lines
3.2 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ofdgo
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
)
|
|
|
|
// U3DBone 保存相对父骨骼的初始位姿，Orientation按W、X、Y、Z排列
|
|
// Attributes标志决定链接、关节字段是否存在，以及各轴旋转约束是否启用和限幅
|
|
// RotationConstraints按X、Y、Z轴排列，每项依次为上限、下限；未指定骨骼姿态时不变形
|
|
type U3DBone struct {
|
|
Name, Parent string
|
|
Attributes uint32
|
|
Length float32
|
|
Displacement [3]float32
|
|
Orientation [4]float32
|
|
LinkCount uint32
|
|
LinkLength float32
|
|
StartJoint, EndJoint U3DBoneJoint
|
|
RotationConstraints [3][2]float32
|
|
}
|
|
|
|
// U3DBoneJoint 保存骨骼局部坐标系内关节椭圆的中心偏移和两轴尺寸
|
|
type U3DBoneJoint struct {
|
|
Center, Scale [2]float32
|
|
}
|
|
|
|
// skeleton 按ECMA-363第9.6.1.1.6节读取骨架，三角网格、点集和线集共用
|
|
// 入参: r 字段读取器
|
|
// 返回: []U3DBone 按父项在前排列的骨骼, error 结构、预算或取消错误
|
|
func (d *u3dDecoder) skeleton(r *u3dValues) ([]U3DBone, error) {
|
|
count := r.u32()
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if count == 0 {
|
|
return nil, nil
|
|
}
|
|
if uint64(count) > uint64(len(r.data)-r.pos)/64 {
|
|
return nil, io.ErrUnexpectedEOF
|
|
}
|
|
if err := d.reserve(uint64(count), 256); err != nil {
|
|
return nil, err
|
|
}
|
|
bones := make([]U3DBone, int(count))
|
|
names := make(map[string]bool, int(count))
|
|
for index := range bones {
|
|
if index%256 == 0 {
|
|
if err := d.ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
bone := &bones[index]
|
|
bone.Name, bone.Parent = r.text(), r.text()
|
|
bone.Attributes, bone.Length = r.u32(), r.f32()
|
|
for component := range bone.Displacement {
|
|
bone.Displacement[component] = r.f32()
|
|
}
|
|
for component := range bone.Orientation {
|
|
bone.Orientation[component] = r.f32()
|
|
}
|
|
if bone.Attributes&1 != 0 {
|
|
bone.LinkCount, bone.LinkLength = r.u32(), r.f32()
|
|
}
|
|
if bone.Attributes&2 != 0 {
|
|
for _, joint := range []*U3DBoneJoint{&bone.StartJoint, &bone.EndJoint} {
|
|
joint.Center = [2]float32{r.f32(), r.f32()}
|
|
joint.Scale = [2]float32{r.f32(), r.f32()}
|
|
}
|
|
}
|
|
for axis := range bone.RotationConstraints {
|
|
bone.RotationConstraints[axis] = [2]float32{r.f32(), r.f32()}
|
|
}
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if bone.Attributes & ^uint32(255) != 0 {
|
|
return nil, fmt.Errorf("invalid U3D bone attributes")
|
|
}
|
|
if names[bone.Name] {
|
|
return nil, fmt.Errorf("duplicate U3D bone %q", bone.Name)
|
|
}
|
|
if index == 0 && bone.Parent != "" || index != 0 && !names[bone.Parent] {
|
|
return nil, fmt.Errorf("invalid U3D bone parent %q", bone.Parent)
|
|
}
|
|
names[bone.Name] = true
|
|
}
|
|
return bones, nil
|
|
}
|